Grinding-machine.



No1 783,086. PATENTED FEB. 21, 1905.

- J. K. STEWART.

GRINDING IMIAGHINE.v

APPLICATION FILED APB.. 7. 1904.

x L h y DMzK/zor, 5TM/ M509 v/ @MM l UNITED STATES Patented February 21, 1905.

PATENT' OFFICE.

GFillNDING-MACHINEi SPECIFICATION formingv part of Letters Patent No 783,086, dated February 21, 1.905. Application filed April 7, 1904. Serial No. 202,016.

quiring to be dressed, ground, or polishedv upon a surface which is required to be true to a given form,whether perfectly plain or spherically concave or convex. vlts purpose is to provide an improved means for holding the work automatically and accurately to the `grinding-surface and for moving it thereon sol as to distribute the wear over the grindingsurface.

It consists of the features of construction set out in the claims.

In the drawings, Figure 1 is a plan view of my machine. Fig. 2 is a side elevation. Fig. 3 is a rear elevation. Fig. i is a detail sec tion of the cross-head and Acircular grindingplate at the line 4C 4 on Fig.

In my improved machine a standard 'A has journaied in it a horizontal shaft B, which carries a beveled gear C and an eccentric D. The beveled gear meshes :with the beveled pinion E on the vertical shaitof the circular grinding-plate F, which is also journaled in the standard, being mounted on the upper end or" its shaft above the cross-head A', with which the standard is provided at the `top and which has lugs A A2 projecting upfrom its opposite ends at diametrically oppositesides of the circular grinding-plate F. i slide G ex tends across the machine above the grindingplate and is guided at its end s yin the lugs if under antifriction-rollers H H, journaled in the lugs to receive the upward pressure of the slide. To the under side of the slide there is secured a spring-bar' J, which is made fast to the slide at the middle of the length of the `slide and also ot the spring-bar and tends to lie tiet up against the under side of the slide. Screws J nl are set through the slide at a little distance each side ot' the point at which the spring-bar is fastened to the slide for forcing the spring-har down at either end toward the upper surface of the grinding-plate. The spring-bar carries near its ends any suitable holder K for the work to be ground, such holder being pivoted to thel spring-bar, so that the work held by it can accommodate itseltl to the surface of the grinding-plate when it is yieldingly pressed thereonto by setting the screw J down through the slidebar against the spring-bar.

The particular form ot' clipl shown is one suitable for holding a knife L of a shearingtool. This is selected merely for the purpose of illustrating the use ot' the machine, and the form as to its adaptation to engage the knife is not a distinctive feature of the invention.

At the lower part ofthe frame A there is fulcrumed for rocking on the stud M an upstanding ,lever N, which.- has an oblong slot N', in which the eccentric D operates to rock said lever back and forth as the shaft rotates.

The lever extends upward from the slide, be-

ing deiiected outward to pass the margin of` the grinding-plate, above which it has the arm N2 projecting inward and at its inner end provided with means tor engaging the slide GQ said engagement being effected by means of a Stud H2 projecting up from the slide and passing through a'swiveled terminal N3, which is -setinto the end of the horizontal armV N" of the lever N and is free to turn therein about a horizontal axis. l

` The shaft B is provided with any suitable means for rotating it, and for light Work it may be rotated by hand by means oi a crank P. T he upper surface of the grinding-'plate F is adapted to carry grinding material, such as a paste of iiour o1 emery and oil, and to more perfectly adapt it to that-use it has the' tine spiral groovef for assisting in holding and distributing the grinding-paste.

The knife or other article to be ground be.- ing properly attached to the clip provided for holding it, and the spring-bar ,l being adjusted by means of screw J to press the knife with suitable degree oi' pressure upon the grindin plata the rotation ci the shaft ld rotating the plate alsocauscs the rock'ng IOO . plete facing its grind ing-surface, havin lever N to reciprocate thesiide H for cerrying the Work readiiy in and outover the grinding-plete., the range of movement being siiin cient to bring the whole evailabie grinding- Surface oi the plete into action to snbstentieiiy equal extent. v

it Wiii he seen that this machine is not iimited to grinding or polishing at surfaces., but that the grinding-Nate mey be sphericaiiy convex or concave and that the slide-ber G, having corresponding curvature, will carry the Work in a suitably-'curved pethend cause it to `be ground hollow or'fconvexs according to the formation of the grinding-pitite. iin the drawings i have shown a plate slightly convex for the purpose of grinding the knife slightly hohovv. For such'slight curve-.ture es is here illustrated it is probebiy not necessery to curve the siide. because the springioer J Wiii yield suiicientiy to accommodate such slight curvature without meterieiiy ver; in@` the pressore et the different parte' of the peti] of the Work in out over the grinding-piste.

i. A grinding-machine comprising e rotery grinding-pieter, e slide extending across the for holding the Work eg `inst seid s l rocking iever inicruined about en exis right engies to the exis. oi rotation of the piet-e end having erin extending' into engagement with the slide; ineens 1Eer rocking the lever end nieens the engagement oi' the iever and siide for accommodziting the rocking' move ment of the lever to the reciproceting; movement of the slider i=indingineciiine comprising e. rotery ,-piete; she-ft right to the exis 'or i beveled ...rs conifiectii,P with the shaft and f plete for communicating rotation from the for nier tcthe ietter; e siieit uicruined for rockn ing1 et the opposite side oi" the shaft ii'oni that et which piste is situated. extending' pest seid sha-ft past the .margin oi' the pitite end provided with en erin overhang, he

ion oi' the pitite; interineeiiing' ietter; ineens on the shaft engaging the lever for rocking it es the shaft rotates. 'and ineens connected with seid-overhenging arm for cer,- rying the Work.

3. A grinding-machine comprising a rotary grinding-plete; e spindie for' mounting sind journaling toe seme; e shaft at right angles to such spindie; e Standard in which the shaft and spindle are journeied; intermeshing gears on the shaft and. spindle 'for communicating rotation from the former to the letter; e lever mounted on the stendardi vfor rocking ehout e iuicrurn `pitreiiei to thevshaft,A seid ievei: extending pest the sheit and pest the merginof the rotary grindingpiete end having en erm projecting oppositethegrinding-iece ssv of the latter; en eccentric cem on the shaft engaging the iever for rocking it es the shaft rotates., the standard having e cross-heed he v tween the shei't end the plete.,'seid cross-heed having; ings extending; pest the margin oi the piatte et opposite sides thereof@ asiide mounted in seid ings et the opposite side ci' the pitite i'roni cross-head; means on the Siide tor hoidingg the work and for -viedingdy pressn in it tor/verd the plete, end operating-:5 connectiene between the erm of the lever' and the eiide for' reciprocating the iatter es the ierer iochs. i

4;. grindingenachine comprising e rotary grindinggmiete; e standard et the top ci' which pitite jonrneied `fior rotation about its GEN MEBWN STEWART. in presence oil- Leitseite iti. LA @nA-Noia.,

d. ininv. 

